Chemistry B (9-1) - Twenty First Century Science Suite J258 9-1: Chemicals of the natural environment Topical Past Paper Questions
OCR GCSE (9-1) Chemistry B (9-1) - Twenty First Century Science Suite J258 (9-1) past-paper questions on Chemicals of the natural environment, free. This topic is frequently examined across 6 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
Scientists collect data to explain how the Earth's atmosphere formed. The graph shows how the percentages of some gases in the atmosphere have changed since 4400 million years ago. Percentage of each gas in the atmosphere Scientists also study the composition of gases that come o…
Ammonia is made on an industrial scale in a reaction between nitrogen and hydrogen. The equation to make ammonia is shown. $$ \mathrm{N}_{2}(\mathrm{g})+\mathrm{3H}_{2}(\mathrm{g})\rightleftharpoons2\mathrm{NH}_{3}(\mathrm{g}) $$ (a) What is the atom economy of this reaction? Exp…
Aluminium is extracted from aluminium oxide by electrolysis. The diagram shows the tank used to electrolyse aluminium oxide. (a) (i) Before electrolysis, solid aluminium oxide is dissolved in a hot, molten compound called cryolite. The formula for cryolite is $Na_{3}AlF_{6}$. Exp…
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